WARNING: Multiple lengths were specified for the variable STANDARD_LAB_TYPE by input data set(s). This may
cause truncation of data.
WARNING: Multiple lengths were specified for the variable STANDARD_LAB_NAME by input data set(s). This may
cause truncation of data.
WARNING: Multiple lengths were specified for the variable LBTESTID by input data set(s). This may cause
truncation of data.

Another way would be to just rename the variables when you read them (a rename as part of the set statement) and then define the output vars the way you want them and assign the renamed vars to the output vars.